SNCF Societe Nationale des Chemins de Fer

French, France

SNCF Societe Nationale des Chemins de Fer

French, France
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Cui Y.-J.,ParisTech National School of Bridges and Roads | Tang A.-M.,ParisTech National School of Bridges and Roads | Loiseau C.,SNCF Societe Nationale des Chemins de Fer | Delage P.,ParisTech National School of Bridges and Roads
Geomechanics and Geotechnics: From Micro to Macro - Proceedings of the International Symposium on Geomechanics and Geotechnics: From Micro to Macro, IS-Shanghai 2010 | Year: 2011

In order to describe the hydro-mechanical behaviour of compacted expansive clay, in the present work, a microstructure-based constitutive model was elaborated based on the following assumptions: (i) the soil porosity can be divided into two levels: microstructural and macrostructural levels; (ii) the plastic deformation correspond to the collapse of the mac-rostructural porosity. The parameters of the model were calibrated using results from suction-controlled oedometer tests performed on a compacted clay/sand mixture. These parameters were then used to simulate the swelling pressure generated when wetting the soil mixture under constant-volume conditions. Comparison between the modelling and the experimental results showed that the model satisfactorily reproduced the relationships between the suction and the generated swelling pressure, as well as the changes in volumetric water content. © 2011 Taylor & Francis Group.

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